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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bbf765dfb7a6fb57ac58b9ef7f84c7f0337a786a829e20094e3d50539622d6' 
  AND token = 'MUtkKq7iMN6PnMvCQFZYyfGhv/vaM9cDRzyh/NWSH8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}